i have a S20 and a trunk with three channels. i want only two concurrent incoming calls (the third should receive a hangup) so that the third channel is free for outgoing calls and the other way - not more than two outgoing calls so there is a free channel for incoming calls.
how do i realize that?
my idea is to setup two identicaly trunks each with two channels - one for incoming calls and one for outgoing - I think this should work but thats my first VOIP PBX and i dont know if this is the right way...
Edit:
i tried it out but as soon as i have two trunks with the same login information all incoming calls hang up immediately (except i add both trunks to the inbound route).
That's obviously not the way how to do it :(
can someone please help me with that problem?
A trunk is basically an entity that is used to identify a given site/pbx so as to let the provider and PBX route calls to and from, provided that the authentication criteria or IP is correct to the provider's expectations. Calls are sent using the trunk and these are typically referred to as call paths.
As the inbound and outbound rules are directed towards trunks, you can use these to accomplish your desire.
Now then, it is up to the provider as to what they support for trunk utilization and I assume that your provider may not allow multiple registrations to what is essentially the same trunk from the same device using the same credentials. Most do not.
In your case, it sounds like you need to add a trunk at the provider and at the S PBX. This trunk would be set up with its own DID and have the CID masked to reflect that of the primary inbound number. In this way, when calls are made outbound from your newly installed trunk it will reflect the number that you want callers to use when calling back in and not that of the one used to make the call. Essentially you will know the the number, but no one else will. You can then use the inbound and outbound routes to set up which trunks are taking inbound calls thereby reserving the new one to keep as an open outbound. You can then set up one of the other as a fail-over outbound in the event that the new trunk is busy already handling an outbound call.
The provider really does not care about which way the call flows as they only know it to be a path. You have to manage it at the PBX, but it will be imperative that you do not disclose the new trunk number; otherwise folks will use it should they find out, which will again defeat your purpose.
Your other option is to simply not have an inbound rule for a given trunk so that calls cannot come in, but this may not be ideal as the caller may be given failure messages from their provider that your number is out-of-service, has been disconnect or something else that may give them pause.
Thank you very much Larry Neblett
i will talk to Telekom and ask whether multiple registrations or different CID is possible.
Wouldn't it be great to set the max. concurrent calls in the in- and outbound route? I will post this in the feature request forum.
